Screen Lock App/Theme

I dont know if this even exists, but I was looking for either a replacement app/theme or something that would give me more choices to choose from for my lock screen. On my Infuse, I just get the boring slide to unlock, or pattern lock screen choices. I was wondering if there is a theme to download or an app that is reliable that would give me what I'm looking for. Or would I just need to find a ROM for my phone?